Ok, thinking about deleting the cat from the car (95-Z). If I were to put a straight pipe in its place, would the computer see this as the catalytic not doing it's job and say 'check engine' or do some other thing. I know that in some cases, the computer uses the catalytic converter to meter the amount of fuel and air being burned so it can adjust accordingly. Any input on this is appreciated.

 

The only time you'd worry would be on an OBDII car (96+). OBDII cars have post-cat oxygen sensors to determine whether or not the cats are doing their job (would result in an SES, fixed with O2 simms), whereas an OBDI car does not. You won't get an SES light in doing so.

 

Ur Catalytic Converter has NOTHING to do with reading ur cars air fuel ratio. That would be the O2 sims, which come up in the Y-pipe area before the converter.

Ditch the cat. for sure if ur not worried about emissions. U won't have to worry about it getting clogged later and robbing ur performance, like it has for me. U shouldn't throw any codes from it either.

 

Well, that takes all the guesswork out of it. I really wasn't too sure if that would impact on the car or not, but now I know. Thanks.

 

Actually, all O2 simms do is trick the PCM into thinking that there are still post-cat O2 sensors still existing and functioning. You do not want to touch the O2s that are prior to the cat, as those are crucial for engine management and fuel delivery.

 

i also own a 95z, i just took mine out, put a straight pipe, the muffler shop only charged me 70 bucks, it didnt do anything to the car at all, but it sure goes better and sounds better.